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Portability fixes to OpenGL example application (courtesy of djoshea)

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This commit is contained in:
ocornut 2014-08-12 11:21:47 +01:00
parent 150ad95bd6
commit 8825545653
1 changed files with 12 additions and 10 deletions
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22
examples/opengl_example/main.cpp
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@ -39,7 +39,7 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
buffer_data += cmd_list->vtx_buffer.size() * sizeof(ImDrawVert); buffer_data += cmd_list->vtx_buffer.size() * sizeof(ImDrawVert);
} }
glUnmapBuffer(GL_ARRAY_BUFFER); glUnmapBuffer(GL_ARRAY_BUFFER);
// Setup render state: alpha-blending enabled, no face culling, no depth testing // Setup render state: alpha-blending enabled, no face culling, no depth testing
glEnable(GL_BLEND); glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@ -55,7 +55,7 @@ static void ImImpl_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_c
// Setup orthographic projection matrix // Setup orthographic projection matrix
const float width = ImGui::GetIO().DisplaySize.x; const float width = ImGui::GetIO().DisplaySize.x;
const float height = ImGui::GetIO().DisplaySize.y; const float height = ImGui::GetIO().DisplaySize.y;
const float mvp[4][4] = const float mvp[4][4] =
{ {
{ 2.0f/width, 0.0f, 0.0f, 0.0f }, { 2.0f/width, 0.0f, 0.0f, 0.0f },
{ 0.0f, 2.0f/-height, 0.0f, 0.0f }, { 0.0f, 2.0f/-height, 0.0f, 0.0f },
@ -149,7 +149,7 @@ const GLchar* fragmentSource =
"out vec4 o_col;" "out vec4 o_col;"
"void main() {" "void main() {"
" o_col = texture(Tex, uv) * col;" " o_col = texture(Tex, uv) * col;"
//" if (pixel_pos.x < ClipRect.x || pixel_pos.y < ClipRect.y || pixel_pos.x > ClipRect.z || pixel_pos.y > ClipRect.w) discard;" // Clipping: using discard //" if (pixel_pos.x < ClipRect.x || pixel_pos.y < ClipRect.y || pixel_pos.x > ClipRect.z || pixel_pos.y > ClipRect.w) discard;" // Clipping: using discard
//" if (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w) < 1.0f) discard;" // Clipping: using discard and step //" if (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w) < 1.0f) discard;" // Clipping: using discard and step
" o_col.w *= (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w));" // Clipping: branch-less, set alpha 0.0f " o_col.w *= (step(ClipRect.x,pixel_pos.x) * step(ClipRect.y,pixel_pos.y) * step(pixel_pos.x,ClipRect.z) * step(pixel_pos.y,ClipRect.w));" // Clipping: branch-less, set alpha 0.0f
"}"; "}";
@ -191,13 +191,13 @@ void InitGL()
if (!glfwInit()) if (!glfwInit())
exit(1); exit(1);
//glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
//glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
//glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_REFRESH_RATE, 60); glfwWindowHint(GLFW_REFRESH_RATE, 60);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE); glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
window = glfwCreateWindow(1280, 720, "ImGui OpenGL example", nullptr, nullptr); window = glfwCreateWindow(1280, 720, "ImGui OpenGL example", NULL, NULL);
glfwMakeContextCurrent(window); glfwMakeContextCurrent(window);
glfwSetKeyCallback(window, glfw_key_callback); glfwSetKeyCallback(window, glfw_key_callback);
@ -207,8 +207,10 @@ void InitGL()
glewExperimental = GL_TRUE; glewExperimental = GL_TRUE;
glewInit(); glewInit();
GLenum err = GL_NO_ERROR; // After calling glewInit() our GL error state may be GL_INVALID_ENUM
err = glGetError(); IM_ASSERT(err == GL_NO_ERROR); const GLenum err = glGetError();
(void)err;
IM_ASSERT(err == GL_NO_ERROR || err == GL_INVALID_ENUM);
} }
void InitImGui() void InitImGui()