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gl_rasterizer: add clipping plane z<=0 defined in PICA

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This commit is contained in:
wwylele 2017-08-17 10:46:59 +03:00
parent 46d1ca768d
commit 1eca380886
4 changed files with 21 additions and 0 deletions
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3
src/video_core/renderer_opengl/gl_rasterizer.cpp
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@ -28,6 +28,9 @@ MICROPROFILE_DEFINE(OpenGL_Blits, "OpenGL", "Blits", MP_RGB(100, 100, 255));
MICROPROFILE_DEFINE(OpenGL_CacheManagement, "OpenGL", "Cache Mgmt", MP_RGB(100, 255, 100));
RasterizerOpenGL::RasterizerOpenGL() : shader_dirty(true) {
// Clipping plane 0 is always enabled for PICA fixed clip plane z <= 0
state.clip_distance[0] = true;
// Create sampler objects
for (size_t i = 0; i < texture_samplers.size(); ++i) {
texture_samplers[i].Create();

2
src/video_core/renderer_opengl/gl_shader_gen.cpp
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@ -1196,6 +1196,8 @@ void main() {
normquat = vert_normquat;
view = vert_view;
gl_Position = vec4(vert_position.x, vert_position.y, -vert_position.z, vert_position.w);
gl_ClipDistance[0] = -vert_position.z; // fixed PICA clipping plane z <= 0
// TODO (wwylele): calculate gl_ClipDistance[1] from user-defined clipping plane
}
)";

13
src/video_core/renderer_opengl/gl_state.cpp
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@ -68,6 +68,8 @@ OpenGLState::OpenGLState() {
draw.vertex_buffer = 0;
draw.uniform_buffer = 0;
draw.shader_program = 0;
clip_distance = {};
}
void OpenGLState::Apply() const {
@ -261,6 +263,17 @@ void OpenGLState::Apply() const {
glUseProgram(draw.shader_program);
}
// Clip distance
for (size_t i = 0; i < clip_distance.size(); ++i) {
if (clip_distance[i] != cur_state.clip_distance[i]) {
if (clip_distance[i]) {
glEnable(GL_CLIP_DISTANCE0 + i);
} else {
glDisable(GL_CLIP_DISTANCE0 + i);
}
}
}
cur_state = *this;
}

3
src/video_core/renderer_opengl/gl_state.h
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@ -4,6 +4,7 @@
#pragma once
#include <array>
#include <glad/glad.h>
namespace TextureUnits {
@ -123,6 +124,8 @@ public:
GLuint shader_program; // GL_CURRENT_PROGRAM
} draw;
std::array<bool, 2> clip_distance; // GL_CLIP_DISTANCE
OpenGLState();
/// Get the currently active OpenGL state