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Examples: OpenGL3: Tweaks.

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This commit is contained in:
ocornut 2015-04-09 21:18:43 +01:00
parent 37f1715bfa
commit 90766141b3
1 changed files with 4 additions and 5 deletions
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9
examples/opengl3_example/imgui_impl_glfw_gl3.cpp
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@ -23,7 +23,7 @@ static GLuint g_FontTexture = 0;
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 size_t g_VboMaxSize = 20000;
static size_t g_VboSize = 0;
static unsigned int g_VboHandle = 0, g_VaoHandle = 0;
// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
@ -62,11 +62,10 @@ static void ImGui_ImplGlfwGL3_RenderDrawLists(ImDrawList** const cmd_lists, int
for (int n = 0; n < cmd_lists_count; n++)
total_vtx_count += cmd_lists[n]->vtx_buffer.size();
glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
size_t neededBufferSize = total_vtx_count * sizeof(ImDrawVert);
if (neededBufferSize > g_VboMaxSize)
size_t needed_vtx_size = total_vtx_count * sizeof(ImDrawVert);
if (g_VboSize < needed_vtx_size)
{
g_VboMaxSize = neededBufferSize + 5000; // Grow buffer
glBufferData(GL_ARRAY_BUFFER, g_VboMaxSize, NULL, GL_STREAM_DRAW);
glBufferData(GL_ARRAY_BUFFER, g_VboSize, NULL, GL_STREAM_DRAW);
}
// Copy and convert all vertices into a single contiguous buffer