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To support drivers with strict core profiles, a buffer is used for the indices as well (fixes ocornut/imgui#277).

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This commit is contained in:
Nik Voss 2015-07-19 17:56:14 +02:00
parent 83ebbebadd
commit bc9bae6d01
1 changed files with 11 additions and 4 deletions
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15
examples/opengl3_example/imgui_impl_glfw_gl3.cpp
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@ -24,7 +24,7 @@ static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0;
static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0;
static int g_VboSize = 0;
static unsigned int g_VboHandle = 0, g_VaoHandle = 0;
static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0;
// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
// If text or lines are blurry when integrating ImGui in your engine:
@ -61,7 +61,7 @@ static void ImGui_ImplGlfwGL3_RenderDrawLists(ImDrawData* draw_data)
for (int n = 0; n < draw_data->CmdListsCount; n++)
{
const ImDrawList* cmd_list = draw_data->CmdLists[n];
const ImDrawIdx* idx_buffer = &cmd_list->IdxBuffer.front();
const ImDrawIdx* idx_buffer_offset = 0;
glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
int needed_vtx_size = cmd_list->VtxBuffer.size() * sizeof(ImDrawVert);
@ -78,6 +78,9 @@ static void ImGui_ImplGlfwGL3_RenderDrawLists(ImDrawData* draw_data)
memcpy(vtx_data, &cmd_list->VtxBuffer[0], cmd_list->VtxBuffer.size() * sizeof(ImDrawVert));
glUnmapBuffer(GL_ARRAY_BUFFER);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW);
for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++)
{
if (pcmd->UserCallback)
@ -88,15 +91,16 @@ static void ImGui_ImplGlfwGL3_RenderDrawLists(ImDrawData* draw_data)
{
glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
glScissor((int)pcmd->ClipRect.x, (int)(height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y));
glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer);
glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset);
}
idx_buffer += pcmd->ElemCount;
idx_buffer_offset += pcmd->ElemCount;
}
}
// Restore modified state
glBindVertexArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glUseProgram(last_program);
glDisable(GL_SCISSOR_TEST);
glBindTexture(GL_TEXTURE_2D, last_texture);
@ -212,6 +216,7 @@ bool ImGui_ImplGlfwGL3_CreateDeviceObjects()
g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color");
glGenBuffers(1, &g_VboHandle);
glGenBuffers(1, &g_ElementsHandle);
glGenVertexArrays(1, &g_VaoHandle);
glBindVertexArray(g_VaoHandle);
@ -280,6 +285,8 @@ void ImGui_ImplGlfwGL3_Shutdown()
{
if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle);
if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle);
if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle);
g_ElementsHandle = 0;
g_VaoHandle = 0;
g_VboHandle = 0;