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Created a RenderState for ImGuiRenderPass

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This commit is contained in:
sippeangelo
2015-12-14 20:25:16 +01:00
parent 9cee8b5478
commit 422e6f5264
2 changed files with 19 additions and 37 deletions
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include/Engine/Rendering/ImGuiRenderPass.h
+17
View File
@@ -1,6 +1,7 @@
#include <imgui/imgui.h>
#include "../OpenGL.h"
#include "IRenderer.h"
#include "RenderState.h"
#include "../Core/EventBroker.h"
#include "../Core/EMousePress.h"
#include "../Core/EMouseRelease.h"
@@ -10,6 +11,22 @@
#include "../Core/EKeyUp.h"
#include "../Core/EKeyboardChar.h"
class ImGuiRenderState : public RenderState
{
public:
ImGuiRenderState()
: RenderState()
{
BindFramebuffer(0);
Enable(GL_BLEND);
BlendEquation(GL_FUNC_ADD);
BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
Disable(GL_CULL_FACE);
Disable(GL_DEPTH_TEST);
Enable(GL_SCISSOR_TEST);
}
};
class ImGuiRenderPass
{
public:
src/Engine/Rendering/ImGuiRenderPass.cpp
+2 -37
View File
@@ -69,29 +69,8 @@ void ImGuiRenderPass::Draw()
ImDrawData* draw_data = ImGui::GetDrawData();
// Backup GL state
GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program);
GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer);
GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array);
GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src);
GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst);
GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb);
GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha);
GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
GLboolean last_enable_blend = glIsEnabled(GL_BLEND);
GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE);
GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST);
GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST);
// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled
glEnable(GL_BLEND);
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glEnable(GL_SCISSOR_TEST);
// Set up render state
ImGuiRenderState state;
glActiveTexture(GL_TEXTURE0);
// Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays)
@@ -134,20 +113,6 @@ void ImGuiRenderPass::Draw()
}
}
// Restore modified GL state
glUseProgram(last_program);
glBindTexture(GL_TEXTURE_2D, last_texture);
glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer);
glBindVertexArray(last_vertex_array);
glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha);
glBlendFunc(last_blend_src, last_blend_dst);
if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND);
if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE);
if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST);
glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
// Start next frame
newFrame();
}