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SoftwareGLContext.cpp
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SoftwareGLContext.cpp
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/*
* Copyright (c) 2021, Jesse Buhagiar <[email protected]>
* Copyright (c) 2021, Stephan Unverwerth <[email protected]>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/Debug.h>
#include <AK/Format.h>
#include <AK/QuickSort.h>
#include <AK/StringBuilder.h>
#include <AK/TemporaryChange.h>
#include <AK/Variant.h>
#include <AK/Vector.h>
#include <LibGL/SoftwareGLContext.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Painter.h>
#include <LibGfx/Vector4.h>
#include <LibSoftGPU/Device.h>
#include <LibSoftGPU/Enums.h>
#include <LibSoftGPU/ImageFormat.h>
namespace GL {
static constexpr size_t MODELVIEW_MATRIX_STACK_LIMIT = 64;
static constexpr size_t PROJECTION_MATRIX_STACK_LIMIT = 8;
static constexpr size_t TEXTURE_MATRIX_STACK_LIMIT = 8;
#define APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(name, ...) \
if (should_append_to_listing()) { \
append_to_listing<&SoftwareGLContext::name>(__VA_ARGS__); \
if (!should_execute_after_appending_to_listing()) \
return; \
}
#define APPEND_TO_CALL_LIST_WITH_ARG_AND_RETURN_IF_NEEDED(name, arg) \
if (should_append_to_listing()) { \
auto ptr = store_in_listing(arg); \
append_to_listing<&SoftwareGLContext::name>(*ptr); \
if (!should_execute_after_appending_to_listing()) \
return; \
}
#define RETURN_WITH_ERROR_IF(condition, error) \
if (condition) { \
dbgln_if(GL_DEBUG, "{}(): error {:#x}", __func__, error); \
if (m_error == GL_NO_ERROR) \
m_error = error; \
return; \
}
#define RETURN_VALUE_WITH_ERROR_IF(condition, error, return_value) \
if (condition) { \
dbgln_if(GL_DEBUG, "{}(): error {:#x}", __func__, error); \
if (m_error == GL_NO_ERROR) \
m_error = error; \
return return_value; \
}
SoftwareGLContext::SoftwareGLContext(Gfx::Bitmap& frontbuffer)
: m_viewport(frontbuffer.rect())
, m_frontbuffer(frontbuffer)
, m_rasterizer(frontbuffer.size())
, m_device_info(m_rasterizer.info())
{
m_texture_units.resize(m_device_info.num_texture_units);
m_active_texture_unit = &m_texture_units[0];
// Query the number lights from the device and set set up their state
// locally in the GL
m_light_states.resize(m_device_info.num_lights);
// Set-up light0's state, as it has a different default state
// to the other lights, as per the OpenGL 1.5 spec
auto& light0 = m_light_states.at(0);
light0.diffuse_intensity = { 1.0f, 1.0f, 1.0f, 1.0f };
light0.specular_intensity = { 1.0f, 1.0f, 1.0f, 1.0f };
m_light_state_is_dirty = true;
m_client_side_texture_coord_array_enabled.resize(m_device_info.num_texture_units);
m_client_tex_coord_pointer.resize(m_device_info.num_texture_units);
m_current_vertex_tex_coord.resize(m_device_info.num_texture_units);
for (auto& tex_coord : m_current_vertex_tex_coord)
tex_coord = { 0.0f, 0.0f, 0.0f, 1.0f };
// Initialize the texture coordinate generation coefficients
// Indices 0,1,2,3 refer to the S,T,R and Q coordinate of the respective texture
// coordinate generation config.
m_texture_coordinate_generation.resize(m_device_info.num_texture_units);
for (auto& texture_coordinate_generation : m_texture_coordinate_generation) {
texture_coordinate_generation[0].object_plane_coefficients = { 1.0f, 0.0f, 0.0f, 0.0f };
texture_coordinate_generation[0].eye_plane_coefficients = { 1.0f, 0.0f, 0.0f, 0.0f };
texture_coordinate_generation[1].object_plane_coefficients = { 0.0f, 1.0f, 0.0f, 0.0f };
texture_coordinate_generation[1].eye_plane_coefficients = { 0.0f, 1.0f, 0.0f, 0.0f };
texture_coordinate_generation[2].object_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f };
texture_coordinate_generation[2].eye_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f };
texture_coordinate_generation[3].object_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f };
texture_coordinate_generation[3].eye_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f };
}
build_extension_string();
}
Optional<ContextParameter> SoftwareGLContext::get_context_parameter(GLenum name)
{
switch (name) {
case GL_ALPHA_BITS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = sizeof(float) * 8 } };
case GL_ALPHA_TEST:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_alpha_test_enabled } };
case GL_BLEND:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_blend_enabled } };
case GL_BLEND_DST_ALPHA:
return ContextParameter { .type = GL_INT, .value = { .integer_value = static_cast<GLint>(m_blend_destination_factor) } };
case GL_BLEND_SRC_ALPHA:
return ContextParameter { .type = GL_INT, .value = { .integer_value = static_cast<GLint>(m_blend_source_factor) } };
case GL_BLUE_BITS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = sizeof(float) * 8 } };
case GL_COLOR_MATERIAL:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_color_material_enabled } };
case GL_COLOR_MATERIAL_FACE:
return ContextParameter { .type = GL_INT, .value = { .integer_value = static_cast<GLint>(m_color_material_face) } };
case GL_COLOR_MATERIAL_MODE:
return ContextParameter { .type = GL_INT, .value = { .integer_value = static_cast<GLint>(m_color_material_mode) } };
case GL_CULL_FACE:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_cull_faces } };
case GL_DEPTH_BITS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = sizeof(float) * 8 } };
case GL_DEPTH_TEST:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_depth_test_enabled } };
case GL_DITHER:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_dither_enabled } };
case GL_DOUBLEBUFFER:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = true } };
case GL_FOG: {
auto fog_enabled = m_rasterizer.options().fog_enabled;
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = fog_enabled } };
}
case GL_GREEN_BITS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = sizeof(float) * 8 } };
case GL_LIGHTING:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_lighting_enabled } };
case GL_MAX_LIGHTS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = static_cast<GLint>(m_device_info.num_lights) } };
case GL_MAX_MODELVIEW_STACK_DEPTH:
return ContextParameter { .type = GL_INT, .value = { .integer_value = MODELVIEW_MATRIX_STACK_LIMIT } };
case GL_MAX_PROJECTION_STACK_DEPTH:
return ContextParameter { .type = GL_INT, .value = { .integer_value = PROJECTION_MATRIX_STACK_LIMIT } };
case GL_MAX_TEXTURE_SIZE:
return ContextParameter { .type = GL_INT, .value = { .integer_value = 4096 } };
case GL_MAX_TEXTURE_STACK_DEPTH:
return ContextParameter { .type = GL_INT, .value = { .integer_value = TEXTURE_MATRIX_STACK_LIMIT } };
case GL_MAX_TEXTURE_UNITS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = static_cast<GLint>(m_texture_units.size()) } };
case GL_NORMALIZE:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_normalize } };
case GL_PACK_ALIGNMENT:
return ContextParameter { .type = GL_INT, .value = { .integer_value = m_pack_alignment } };
case GL_PACK_IMAGE_HEIGHT:
return ContextParameter { .type = GL_BOOL, .value = { .integer_value = 0 } };
case GL_PACK_LSB_FIRST:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = false } };
case GL_PACK_ROW_LENGTH:
return ContextParameter { .type = GL_INT, .value = { .integer_value = 0 } };
case GL_PACK_SKIP_PIXELS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = 0 } };
case GL_PACK_SKIP_ROWS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = 0 } };
case GL_PACK_SWAP_BYTES:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = false } };
case GL_POLYGON_OFFSET_FILL:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_depth_offset_enabled } };
case GL_RED_BITS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = sizeof(float) * 8 } };
case GL_SCISSOR_BOX: {
auto scissor_box = m_rasterizer.options().scissor_box;
return ContextParameter {
.type = GL_INT,
.count = 4,
.value = {
.integer_list = {
scissor_box.x(),
scissor_box.y(),
scissor_box.width(),
scissor_box.height(),
} }
};
} break;
case GL_SCISSOR_TEST: {
auto scissor_enabled = m_rasterizer.options().scissor_enabled;
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = scissor_enabled } };
}
case GL_STENCIL_BITS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = m_device_info.stencil_bits } };
case GL_STENCIL_CLEAR_VALUE:
return ContextParameter { .type = GL_INT, .value = { .integer_value = m_clear_stencil } };
case GL_STENCIL_TEST:
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = m_stencil_test_enabled } };
case GL_TEXTURE_1D:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = m_active_texture_unit->texture_1d_enabled() } };
case GL_TEXTURE_2D:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = m_active_texture_unit->texture_2d_enabled() } };
case GL_TEXTURE_3D:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = m_active_texture_unit->texture_3d_enabled() } };
case GL_TEXTURE_CUBE_MAP:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = m_active_texture_unit->texture_cube_map_enabled() } };
case GL_TEXTURE_GEN_Q:
case GL_TEXTURE_GEN_R:
case GL_TEXTURE_GEN_S:
case GL_TEXTURE_GEN_T: {
auto generation_enabled = texture_coordinate_generation(m_active_texture_unit_index, name).enabled;
return ContextParameter { .type = GL_BOOL, .is_capability = true, .value = { .boolean_value = generation_enabled } };
}
case GL_UNPACK_ALIGNMENT:
return ContextParameter { .type = GL_INT, .value = { .integer_value = m_unpack_alignment } };
case GL_UNPACK_IMAGE_HEIGHT:
return ContextParameter { .type = GL_BOOL, .value = { .integer_value = 0 } };
case GL_UNPACK_LSB_FIRST:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = false } };
case GL_UNPACK_ROW_LENGTH:
return ContextParameter { .type = GL_INT, .value = { .integer_value = m_unpack_row_length } };
case GL_UNPACK_SKIP_PIXELS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = 0 } };
case GL_UNPACK_SKIP_ROWS:
return ContextParameter { .type = GL_INT, .value = { .integer_value = 0 } };
case GL_UNPACK_SWAP_BYTES:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = false } };
case GL_VIEWPORT:
return ContextParameter {
.type = GL_INT,
.count = 4,
.value = {
.integer_list = {
m_viewport.x(),
m_viewport.y(),
m_viewport.width(),
m_viewport.height(),
} }
};
default:
dbgln_if(GL_DEBUG, "get_context_parameter({:#x}): unknown context parameter", name);
return {};
}
}
void SoftwareGLContext::gl_begin(GLenum mode)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_begin, mode);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(mode > GL_POLYGON, GL_INVALID_ENUM);
m_current_draw_mode = mode;
m_in_draw_state = true; // Certain commands will now generate an error
}
void SoftwareGLContext::gl_clear(GLbitfield mask)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_clear, mask);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(mask & ~(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT), GL_INVALID_ENUM);
if (mask & GL_COLOR_BUFFER_BIT)
m_rasterizer.clear_color(m_clear_color);
if (mask & GL_DEPTH_BUFFER_BIT)
m_rasterizer.clear_depth(static_cast<float>(m_clear_depth));
if (mask & GL_STENCIL_BUFFER_BIT)
m_rasterizer.clear_stencil(m_clear_stencil);
}
void SoftwareGLContext::gl_clear_color(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_clear_color, red, green, blue, alpha);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
m_clear_color = { red, green, blue, alpha };
}
void SoftwareGLContext::gl_clear_depth(GLdouble depth)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_clear_depth, depth);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
m_clear_depth = depth;
}
void SoftwareGLContext::gl_clear_stencil(GLint s)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_clear_stencil, s);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
m_clear_stencil = static_cast<u8>(s & ((1 << m_device_info.stencil_bits) - 1));
}
void SoftwareGLContext::gl_color(GLdouble r, GLdouble g, GLdouble b, GLdouble a)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_color, r, g, b, a);
m_current_vertex_color = {
static_cast<float>(r),
static_cast<float>(g),
static_cast<float>(b),
static_cast<float>(a),
};
}
void SoftwareGLContext::gl_end()
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_end);
// Make sure we had a `glBegin` before this call...
RETURN_WITH_ERROR_IF(!m_in_draw_state, GL_INVALID_OPERATION);
m_in_draw_state = false;
// FIXME: Add support for the remaining primitive types.
if (m_current_draw_mode != GL_TRIANGLES
&& m_current_draw_mode != GL_TRIANGLE_FAN
&& m_current_draw_mode != GL_TRIANGLE_STRIP
&& m_current_draw_mode != GL_QUADS
&& m_current_draw_mode != GL_QUAD_STRIP
&& m_current_draw_mode != GL_POLYGON) {
m_vertex_list.clear_with_capacity();
dbgln_if(GL_DEBUG, "gl_end(): draw mode {:#x} unsupported", m_current_draw_mode);
RETURN_WITH_ERROR_IF(true, GL_INVALID_ENUM);
}
Vector<size_t, 32> enabled_texture_units;
for (size_t i = 0; i < m_texture_units.size(); ++i) {
if (m_texture_units[i].texture_2d_enabled())
enabled_texture_units.append(i);
}
sync_device_config();
SoftGPU::PrimitiveType primitive_type;
switch (m_current_draw_mode) {
case GL_TRIANGLES:
primitive_type = SoftGPU::PrimitiveType::Triangles;
break;
case GL_TRIANGLE_STRIP:
case GL_QUAD_STRIP:
primitive_type = SoftGPU::PrimitiveType::TriangleStrip;
break;
case GL_TRIANGLE_FAN:
case GL_POLYGON:
primitive_type = SoftGPU::PrimitiveType::TriangleFan;
break;
case GL_QUADS:
primitive_type = SoftGPU::PrimitiveType::Quads;
break;
default:
VERIFY_NOT_REACHED();
}
// Set up normals transform by taking the upper left 3x3 elements from the model view matrix
// See section 2.11.3 of the OpenGL 1.5 spec
auto const& mv_elements = m_model_view_matrix.elements();
auto const model_view_transposed = FloatMatrix3x3(
mv_elements[0][0], mv_elements[1][0], mv_elements[2][0],
mv_elements[0][1], mv_elements[1][1], mv_elements[2][1],
mv_elements[0][2], mv_elements[1][2], mv_elements[2][2]);
auto const& normal_transform = model_view_transposed.inverse();
m_rasterizer.draw_primitives(primitive_type, m_model_view_matrix, normal_transform, m_projection_matrix, m_texture_matrix, m_vertex_list, enabled_texture_units);
m_vertex_list.clear_with_capacity();
}
void SoftwareGLContext::gl_frustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_frustum, left, right, bottom, top, near_val, far_val);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
// Let's do some math!
// FIXME: Are we losing too much precision by doing this?
float a = static_cast<float>((right + left) / (right - left));
float b = static_cast<float>((top + bottom) / (top - bottom));
float c = static_cast<float>(-((far_val + near_val) / (far_val - near_val)));
float d = static_cast<float>(-((2 * (far_val * near_val)) / (far_val - near_val)));
FloatMatrix4x4 frustum {
((2 * (float)near_val) / ((float)right - (float)left)), 0, a, 0,
0, ((2 * (float)near_val) / ((float)top - (float)bottom)), b, 0,
0, 0, c, d,
0, 0, -1, 0
};
if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = m_projection_matrix * frustum;
else if (m_current_matrix_mode == GL_MODELVIEW)
m_projection_matrix = m_model_view_matrix * frustum;
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = m_texture_matrix * frustum;
else
VERIFY_NOT_REACHED();
}
void SoftwareGLContext::gl_ortho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_ortho, left, right, bottom, top, near_val, far_val);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(left == right || bottom == top || near_val == far_val, GL_INVALID_VALUE);
auto rl = right - left;
auto tb = top - bottom;
auto fn = far_val - near_val;
auto tx = -(right + left) / rl;
auto ty = -(top + bottom) / tb;
auto tz = -(far_val + near_val) / fn;
FloatMatrix4x4 projection {
static_cast<float>(2 / rl), 0, 0, static_cast<float>(tx),
0, static_cast<float>(2 / tb), 0, static_cast<float>(ty),
0, 0, static_cast<float>(-2 / fn), static_cast<float>(tz),
0, 0, 0, 1
};
if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = m_projection_matrix * projection;
else if (m_current_matrix_mode == GL_MODELVIEW)
m_projection_matrix = m_model_view_matrix * projection;
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = m_texture_matrix * projection;
else
VERIFY_NOT_REACHED();
}
GLenum SoftwareGLContext::gl_get_error()
{
if (m_in_draw_state)
return GL_INVALID_OPERATION;
auto last_error = m_error;
m_error = GL_NO_ERROR;
return last_error;
}
GLubyte* SoftwareGLContext::gl_get_string(GLenum name)
{
RETURN_VALUE_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION, nullptr);
switch (name) {
case GL_VENDOR:
return reinterpret_cast<GLubyte*>(const_cast<char*>(m_device_info.vendor_name.characters()));
case GL_RENDERER:
return reinterpret_cast<GLubyte*>(const_cast<char*>(m_device_info.device_name.characters()));
case GL_VERSION:
return reinterpret_cast<GLubyte*>(const_cast<char*>("1.5"));
case GL_EXTENSIONS:
return reinterpret_cast<GLubyte*>(const_cast<char*>(m_extensions.characters()));
case GL_SHADING_LANGUAGE_VERSION:
return reinterpret_cast<GLubyte*>(const_cast<char*>("0.0"));
default:
dbgln_if(GL_DEBUG, "gl_get_string({:#x}): unknown name", name);
break;
}
RETURN_VALUE_WITH_ERROR_IF(true, GL_INVALID_ENUM, nullptr);
}
void SoftwareGLContext::gl_load_identity()
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_load_identity);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = FloatMatrix4x4::identity();
else if (m_current_matrix_mode == GL_MODELVIEW)
m_model_view_matrix = FloatMatrix4x4::identity();
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = FloatMatrix4x4::identity();
else
VERIFY_NOT_REACHED();
}
void SoftwareGLContext::gl_load_matrix(const FloatMatrix4x4& matrix)
{
APPEND_TO_CALL_LIST_WITH_ARG_AND_RETURN_IF_NEEDED(gl_load_matrix, matrix);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = matrix;
else if (m_current_matrix_mode == GL_MODELVIEW)
m_model_view_matrix = matrix;
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = matrix;
else
VERIFY_NOT_REACHED();
}
void SoftwareGLContext::gl_matrix_mode(GLenum mode)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_matrix_mode, mode);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(mode < GL_MODELVIEW || mode > GL_TEXTURE, GL_INVALID_ENUM);
m_current_matrix_mode = mode;
}
void SoftwareGLContext::gl_push_matrix()
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_push_matrix);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
switch (m_current_matrix_mode) {
case GL_PROJECTION:
RETURN_WITH_ERROR_IF(m_projection_matrix_stack.size() >= PROJECTION_MATRIX_STACK_LIMIT, GL_STACK_OVERFLOW);
m_projection_matrix_stack.append(m_projection_matrix);
break;
case GL_MODELVIEW:
RETURN_WITH_ERROR_IF(m_model_view_matrix_stack.size() >= MODELVIEW_MATRIX_STACK_LIMIT, GL_STACK_OVERFLOW);
m_model_view_matrix_stack.append(m_model_view_matrix);
break;
case GL_TEXTURE:
RETURN_WITH_ERROR_IF(m_texture_matrix_stack.size() >= TEXTURE_MATRIX_STACK_LIMIT, GL_STACK_OVERFLOW);
m_texture_matrix_stack.append(m_texture_matrix);
break;
default:
VERIFY_NOT_REACHED();
}
}
void SoftwareGLContext::gl_pop_matrix()
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_pop_matrix);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
switch (m_current_matrix_mode) {
case GL_PROJECTION:
RETURN_WITH_ERROR_IF(m_projection_matrix_stack.size() == 0, GL_STACK_UNDERFLOW);
m_projection_matrix = m_projection_matrix_stack.take_last();
break;
case GL_MODELVIEW:
RETURN_WITH_ERROR_IF(m_model_view_matrix_stack.size() == 0, GL_STACK_UNDERFLOW);
m_model_view_matrix = m_model_view_matrix_stack.take_last();
break;
case GL_TEXTURE:
RETURN_WITH_ERROR_IF(m_texture_matrix_stack.size() == 0, GL_STACK_UNDERFLOW);
m_texture_matrix = m_texture_matrix_stack.take_last();
break;
default:
VERIFY_NOT_REACHED();
}
}
void SoftwareGLContext::gl_mult_matrix(FloatMatrix4x4 const& matrix)
{
APPEND_TO_CALL_LIST_WITH_ARG_AND_RETURN_IF_NEEDED(gl_mult_matrix, matrix);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
if (m_current_matrix_mode == GL_MODELVIEW)
m_model_view_matrix = m_model_view_matrix * matrix;
else if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = m_projection_matrix * matrix;
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = m_texture_matrix * matrix;
else
VERIFY_NOT_REACHED();
}
void SoftwareGLContext::gl_rotate(GLdouble angle, GLdouble x, GLdouble y, GLdouble z)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_rotate, angle, x, y, z);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
FloatVector3 axis = { (float)x, (float)y, (float)z };
axis.normalize();
auto rotation_mat = Gfx::rotation_matrix(axis, static_cast<float>(angle * M_PI * 2 / 360));
if (m_current_matrix_mode == GL_MODELVIEW)
m_model_view_matrix = m_model_view_matrix * rotation_mat;
else if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = m_projection_matrix * rotation_mat;
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = m_texture_matrix * rotation_mat;
else
VERIFY_NOT_REACHED();
}
void SoftwareGLContext::gl_scale(GLdouble x, GLdouble y, GLdouble z)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_scale, x, y, z);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
auto scale_matrix = Gfx::scale_matrix(FloatVector3 { static_cast<float>(x), static_cast<float>(y), static_cast<float>(z) });
if (m_current_matrix_mode == GL_MODELVIEW)
m_model_view_matrix = m_model_view_matrix * scale_matrix;
else if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = m_projection_matrix * scale_matrix;
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = m_texture_matrix * scale_matrix;
else
VERIFY_NOT_REACHED();
}
void SoftwareGLContext::gl_translate(GLdouble x, GLdouble y, GLdouble z)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_translate, x, y, z);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
auto translation_matrix = Gfx::translation_matrix(FloatVector3 { static_cast<float>(x), static_cast<float>(y), static_cast<float>(z) });
if (m_current_matrix_mode == GL_MODELVIEW)
m_model_view_matrix = m_model_view_matrix * translation_matrix;
else if (m_current_matrix_mode == GL_PROJECTION)
m_projection_matrix = m_projection_matrix * translation_matrix;
else if (m_current_matrix_mode == GL_TEXTURE)
m_texture_matrix = m_texture_matrix * translation_matrix;
else
VERIFY_NOT_REACHED();
}
void SoftwareGLContext::gl_vertex(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_vertex, x, y, z, w);
SoftGPU::Vertex vertex;
vertex.position = { static_cast<float>(x), static_cast<float>(y), static_cast<float>(z), static_cast<float>(w) };
vertex.color = m_current_vertex_color;
for (size_t i = 0; i < m_device_info.num_texture_units; ++i)
vertex.tex_coords[i] = m_current_vertex_tex_coord[i];
vertex.normal = m_current_vertex_normal;
m_vertex_list.append(vertex);
}
void SoftwareGLContext::gl_tex_coord(GLfloat s, GLfloat t, GLfloat r, GLfloat q)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_tex_coord, s, t, r, q);
m_current_vertex_tex_coord[0] = { s, t, r, q };
}
void SoftwareGLContext::gl_multi_tex_coord(GLenum target, GLfloat s, GLfloat t, GLfloat r, GLfloat q)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_multi_tex_coord, target, s, t, r, q);
RETURN_WITH_ERROR_IF(target < GL_TEXTURE0 || target >= GL_TEXTURE0 + m_device_info.num_texture_units, GL_INVALID_ENUM);
m_current_vertex_tex_coord[target - GL_TEXTURE0] = { s, t, r, q };
}
void SoftwareGLContext::gl_viewport(GLint x, GLint y, GLsizei width, GLsizei height)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_viewport, x, y, width, height);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(width < 0 || height < 0, GL_INVALID_VALUE);
m_viewport = { x, y, width, height };
auto rasterizer_options = m_rasterizer.options();
rasterizer_options.viewport = m_viewport;
m_rasterizer.set_options(rasterizer_options);
}
void SoftwareGLContext::gl_enable(GLenum capability)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_enable, capability);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
auto rasterizer_options = m_rasterizer.options();
bool update_rasterizer_options = false;
switch (capability) {
case GL_COLOR_MATERIAL:
m_color_material_enabled = true;
break;
case GL_CULL_FACE:
m_cull_faces = true;
rasterizer_options.enable_culling = true;
update_rasterizer_options = true;
break;
case GL_DEPTH_TEST:
m_depth_test_enabled = true;
rasterizer_options.enable_depth_test = true;
update_rasterizer_options = true;
break;
case GL_BLEND:
m_blend_enabled = true;
rasterizer_options.enable_blending = true;
update_rasterizer_options = true;
break;
case GL_ALPHA_TEST:
m_alpha_test_enabled = true;
rasterizer_options.enable_alpha_test = true;
update_rasterizer_options = true;
break;
case GL_DITHER:
m_dither_enabled = true;
break;
case GL_FOG:
rasterizer_options.fog_enabled = true;
update_rasterizer_options = true;
break;
case GL_LIGHTING:
m_lighting_enabled = true;
rasterizer_options.lighting_enabled = true;
update_rasterizer_options = true;
break;
case GL_NORMALIZE:
m_normalize = true;
rasterizer_options.normalization_enabled = true;
update_rasterizer_options = true;
break;
case GL_POLYGON_OFFSET_FILL:
m_depth_offset_enabled = true;
rasterizer_options.depth_offset_enabled = true;
update_rasterizer_options = true;
break;
case GL_SCISSOR_TEST:
rasterizer_options.scissor_enabled = true;
update_rasterizer_options = true;
break;
case GL_STENCIL_TEST:
m_stencil_test_enabled = true;
rasterizer_options.enable_stencil_test = true;
update_rasterizer_options = true;
break;
case GL_TEXTURE_1D:
m_active_texture_unit->set_texture_1d_enabled(true);
m_sampler_config_is_dirty = true;
break;
case GL_TEXTURE_2D:
m_active_texture_unit->set_texture_2d_enabled(true);
m_sampler_config_is_dirty = true;
break;
case GL_TEXTURE_3D:
m_active_texture_unit->set_texture_3d_enabled(true);
m_sampler_config_is_dirty = true;
break;
case GL_TEXTURE_CUBE_MAP:
m_active_texture_unit->set_texture_cube_map_enabled(true);
m_sampler_config_is_dirty = true;
break;
case GL_LIGHT0:
case GL_LIGHT1:
case GL_LIGHT2:
case GL_LIGHT3:
case GL_LIGHT4:
case GL_LIGHT5:
case GL_LIGHT6:
case GL_LIGHT7:
m_light_states.at(capability - GL_LIGHT0).is_enabled = true;
m_light_state_is_dirty = true;
break;
case GL_TEXTURE_GEN_Q:
case GL_TEXTURE_GEN_R:
case GL_TEXTURE_GEN_S:
case GL_TEXTURE_GEN_T:
texture_coordinate_generation(m_active_texture_unit_index, capability).enabled = true;
m_texcoord_generation_dirty = true;
break;
default:
dbgln_if(GL_DEBUG, "gl_enable({:#x}): unknown parameter", capability);
RETURN_WITH_ERROR_IF(true, GL_INVALID_ENUM);
}
if (update_rasterizer_options)
m_rasterizer.set_options(rasterizer_options);
}
void SoftwareGLContext::gl_disable(GLenum capability)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_disable, capability);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
auto rasterizer_options = m_rasterizer.options();
bool update_rasterizer_options = false;
switch (capability) {
case GL_COLOR_MATERIAL:
m_color_material_enabled = false;
break;
case GL_CULL_FACE:
m_cull_faces = false;
rasterizer_options.enable_culling = false;
update_rasterizer_options = true;
break;
case GL_DEPTH_TEST:
m_depth_test_enabled = false;
rasterizer_options.enable_depth_test = false;
update_rasterizer_options = true;
break;
case GL_BLEND:
m_blend_enabled = false;
rasterizer_options.enable_blending = false;
update_rasterizer_options = true;
break;
case GL_ALPHA_TEST:
m_alpha_test_enabled = false;
rasterizer_options.enable_alpha_test = false;
update_rasterizer_options = true;
break;
case GL_DITHER:
m_dither_enabled = false;
break;
case GL_FOG:
rasterizer_options.fog_enabled = false;
update_rasterizer_options = true;
break;
case GL_LIGHTING:
m_lighting_enabled = false;
rasterizer_options.lighting_enabled = false;
update_rasterizer_options = true;
break;
case GL_LIGHT0:
case GL_LIGHT1:
case GL_LIGHT2:
case GL_LIGHT3:
case GL_LIGHT4:
case GL_LIGHT5:
case GL_LIGHT6:
case GL_LIGHT7:
m_light_states.at(capability - GL_LIGHT0).is_enabled = false;
m_light_state_is_dirty = true;
break;
case GL_NORMALIZE:
m_normalize = false;
rasterizer_options.normalization_enabled = false;
update_rasterizer_options = true;
break;
case GL_POLYGON_OFFSET_FILL:
m_depth_offset_enabled = false;
rasterizer_options.depth_offset_enabled = false;
update_rasterizer_options = true;
break;
case GL_SCISSOR_TEST:
rasterizer_options.scissor_enabled = false;
update_rasterizer_options = true;
break;
case GL_STENCIL_TEST:
m_stencil_test_enabled = false;
rasterizer_options.enable_stencil_test = false;
update_rasterizer_options = true;
break;
case GL_TEXTURE_1D:
m_active_texture_unit->set_texture_1d_enabled(false);
m_sampler_config_is_dirty = true;
break;
case GL_TEXTURE_2D:
m_active_texture_unit->set_texture_2d_enabled(false);
m_sampler_config_is_dirty = true;
break;
case GL_TEXTURE_3D:
m_active_texture_unit->set_texture_3d_enabled(false);
m_sampler_config_is_dirty = true;
break;
case GL_TEXTURE_CUBE_MAP:
m_active_texture_unit->set_texture_cube_map_enabled(false);
m_sampler_config_is_dirty = true;
break;
case GL_TEXTURE_GEN_Q:
case GL_TEXTURE_GEN_R:
case GL_TEXTURE_GEN_S:
case GL_TEXTURE_GEN_T:
texture_coordinate_generation(m_active_texture_unit_index, capability).enabled = false;
m_texcoord_generation_dirty = true;
break;
default:
dbgln_if(GL_DEBUG, "gl_disable({:#x}): unknown parameter", capability);
RETURN_WITH_ERROR_IF(true, GL_INVALID_ENUM);
}
if (update_rasterizer_options)
m_rasterizer.set_options(rasterizer_options);
}
GLboolean SoftwareGLContext::gl_is_enabled(GLenum capability)
{
RETURN_VALUE_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION, 0);
auto optional_parameter = get_context_parameter(capability);
RETURN_VALUE_WITH_ERROR_IF(!optional_parameter.has_value(), GL_INVALID_ENUM, 0);
auto parameter = optional_parameter.release_value();
RETURN_VALUE_WITH_ERROR_IF(!parameter.is_capability, GL_INVALID_ENUM, 0);
return parameter.value.boolean_value;
}
void SoftwareGLContext::gl_gen_textures(GLsizei n, GLuint* textures)
{
RETURN_WITH_ERROR_IF(n < 0, GL_INVALID_VALUE);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
m_name_allocator.allocate(n, textures);
// Initialize all texture names with a nullptr
for (auto i = 0; i < n; i++) {
GLuint name = textures[i];
m_allocated_textures.set(name, nullptr);
}
}
void SoftwareGLContext::gl_delete_textures(GLsizei n, const GLuint* textures)
{
RETURN_WITH_ERROR_IF(n < 0, GL_INVALID_VALUE);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
for (auto i = 0; i < n; i++) {
GLuint name = textures[i];
if (name == 0)
continue;
m_name_allocator.free(name);
auto texture_object = m_allocated_textures.find(name);
if (texture_object == m_allocated_textures.end() || texture_object->value.is_null())
continue;
// Check all texture units
for (auto& texture_unit : m_texture_units) {
if (texture_object->value == texture_unit.bound_texture())
texture_unit.bind_texture_to_target(GL_TEXTURE_2D, nullptr);
}
m_allocated_textures.remove(name);
}
}
void SoftwareGLContext::gl_tex_image_2d(GLenum target, GLint level, GLint internal_format, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data)
{
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
// We only support GL_TEXTURE_2D for now
RETURN_WITH_ERROR_IF(target != GL_TEXTURE_2D, GL_INVALID_ENUM);
// Check if there is actually a texture bound
RETURN_WITH_ERROR_IF(target == GL_TEXTURE_2D && m_active_texture_unit->currently_bound_target() != GL_TEXTURE_2D, GL_INVALID_OPERATION);
// Internal format can also be a number between 1 and 4. Symbolic formats were only added with EXT_texture, promoted to core in OpenGL 1.1
if (internal_format == 1)
internal_format = GL_ALPHA;
else if (internal_format == 2)
internal_format = GL_LUMINANCE_ALPHA;
else if (internal_format == 3)
internal_format = GL_RGB;
else if (internal_format == 4)
internal_format = GL_RGBA;
// We only support symbolic constants for now
RETURN_WITH_ERROR_IF(!(internal_format == GL_RGB || internal_format == GL_RGBA || internal_format == GL_LUMINANCE8 || internal_format == GL_LUMINANCE8_ALPHA8), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_SHORT_5_6_5), GL_INVALID_VALUE);
RETURN_WITH_ERROR_IF(level < 0 || level > Texture2D::LOG2_MAX_TEXTURE_SIZE, GL_INVALID_VALUE);
RETURN_WITH_ERROR_IF(width < 0 || height < 0 || width > (2 + Texture2D::MAX_TEXTURE_SIZE) || height > (2 + Texture2D::MAX_TEXTURE_SIZE), GL_INVALID_VALUE);
// Check if width and height are a power of 2
if (!m_device_info.supports_npot_textures) {
RETURN_WITH_ERROR_IF((width & (width - 1)) != 0, GL_INVALID_VALUE);
RETURN_WITH_ERROR_IF((height & (height - 1)) != 0, GL_INVALID_VALUE);
}
RETURN_WITH_ERROR_IF(border != 0, GL_INVALID_VALUE);
if (level == 0) {
// FIXME: OpenGL has the concept of texture and mipmap completeness. A texture has to fulfill certain criteria to be considered complete.
// Trying to render while an incomplete texture is bound will result in an error.
// Here we simply create a complete device image when mipmap level 0 is attached to the texture object. This has the unfortunate side effect
// that constructing GL textures in any but the default mipmap order, going from level 0 upwards will cause mip levels to stay uninitialized.
// To be spec compliant we should create the device image once the texture has become complete and is used for rendering the first time.
// All images that were attached before the device image was created need to be stored somewhere to be used to initialize the device image once complete.
m_active_texture_unit->bound_texture_2d()->set_device_image(m_rasterizer.create_image(SoftGPU::ImageFormat::BGRA8888, width, height, 1, 999, 1));
m_sampler_config_is_dirty = true;
}
m_active_texture_unit->bound_texture_2d()->upload_texture_data(level, internal_format, width, height, format, type, data, m_unpack_row_length, m_unpack_alignment);
}
void SoftwareGLContext::gl_tex_sub_image_2d(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid* data)
{
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
// We only support GL_TEXTURE_2D for now
RETURN_WITH_ERROR_IF(target != GL_TEXTURE_2D, GL_INVALID_ENUM);
// Check if there is actually a texture bound