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Backends: OpenGL3: WIP testing alternate way to run buffer updates.
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ocornut committed Aug 26, 2021
1 parent 58f5092 commit 009c1e0
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Showing 2 changed files with 77 additions and 58 deletions.
18 changes: 16 additions & 2 deletions backends/imgui_impl_opengl3.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,8 @@ struct ImGui_ImplOpenGL3_Data
GLuint AttribLocationVtxUV;
GLuint AttribLocationVtxColor;
unsigned int VboHandle, ElementsHandle;
GLsizeiptr VertexBufferSize;
GLsizeiptr IndexBufferSize;
bool HasClipOrigin;

ImGui_ImplOpenGL3_Data() { memset(this, 0, sizeof(*this)); }
Expand Down Expand Up @@ -431,8 +433,20 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
const ImDrawList* cmd_list = draw_data->CmdLists[n];

// Upload vertex/index buffers
glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.Size * (int)sizeof(ImDrawVert), (const GLvoid*)cmd_list->VtxBuffer.Data, GL_STREAM_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.Size * (int)sizeof(ImDrawIdx), (const GLvoid*)cmd_list->IdxBuffer.Data, GL_STREAM_DRAW);
GLsizeiptr vtx_buffer_size = (GLsizeiptr)cmd_list->VtxBuffer.Size * (int)sizeof(ImDrawVert);
GLsizeiptr idx_buffer_size = (GLsizeiptr)cmd_list->IdxBuffer.Size * (int)sizeof(ImDrawIdx);
if (bd->VertexBufferSize < vtx_buffer_size)
{
bd->VertexBufferSize = vtx_buffer_size;
glBufferData(GL_ARRAY_BUFFER, bd->VertexBufferSize, NULL, GL_STREAM_DRAW);
}
if (bd->IndexBufferSize < idx_buffer_size)
{
bd->IndexBufferSize = idx_buffer_size;
glBufferData(GL_ELEMENT_ARRAY_BUFFER, bd->IndexBufferSize, NULL, GL_STREAM_DRAW);
}
glBufferSubData(GL_ARRAY_BUFFER, 0, vtx_buffer_size, (const GLvoid*)cmd_list->VtxBuffer.Data);
glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, idx_buffer_size, (const GLvoid*)cmd_list->IdxBuffer.Data);

for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
{
Expand Down
117 changes: 61 additions & 56 deletions backends/imgui_impl_opengl3_loader.h
Original file line number Diff line number Diff line change
Expand Up @@ -230,11 +230,13 @@ typedef void (APIENTRYP PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
typedef void (APIENTRYP PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);
typedef void (APIENTRYP PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
typedef void (APIENTRYP PFNGLBUFFERDATAPROC) (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
typedef void (APIENTRYP PFNGLBUFFERSUBDATAPROC) (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
#ifdef GL_GLEXT_PROTOTYPES
GLAPI void APIENTRY glBindBuffer (GLenum target, GLuint buffer);
GLAPI void APIENTRY glDeleteBuffers (GLsizei n, const GLuint *buffers);
GLAPI void APIENTRY glGenBuffers (GLsizei n, GLuint *buffers);
GLAPI void APIENTRY glBufferData (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
GLAPI void APIENTRY glBufferSubData (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
#endif
#endif /* GL_VERSION_1_5 */
#ifndef GL_VERSION_2_0
Expand Down Expand Up @@ -416,7 +418,7 @@ GL3W_API GL3WglProc imgl3wGetProcAddress(const char *proc);

/* gl3w internal state */
union GL3WProcs {
GL3WglProc ptr[52];
GL3WglProc ptr[53];
struct {
PFNGLACTIVETEXTUREPROC ActiveTexture;
PFNGLATTACHSHADERPROC AttachShader;
Expand All @@ -428,6 +430,7 @@ union GL3WProcs {
PFNGLBLENDEQUATIONSEPARATEPROC BlendEquationSeparate;
PFNGLBLENDFUNCSEPARATEPROC BlendFuncSeparate;
PFNGLBUFFERDATAPROC BufferData;
PFNGLBUFFERSUBDATAPROC BufferSubData;
PFNGLCLEARPROC Clear;
PFNGLCLEARCOLORPROC ClearColor;
PFNGLCOMPILESHADERPROC CompileShader;
Expand Down Expand Up @@ -473,61 +476,62 @@ union GL3WProcs {
} gl;
};

GL3W_API extern union GL3WProcs gl3wProcs;
GL3W_API extern union GL3WProcs imgl3wProcs;

/* OpenGL functions */
#define glActiveTexture gl3wProcs.gl.ActiveTexture
#define glAttachShader gl3wProcs.gl.AttachShader
#define glBindBuffer gl3wProcs.gl.BindBuffer
#define glBindSampler gl3wProcs.gl.BindSampler
#define glBindTexture gl3wProcs.gl.BindTexture
#define glBindVertexArray gl3wProcs.gl.BindVertexArray
#define glBlendEquation gl3wProcs.gl.BlendEquation
#define glBlendEquationSeparate gl3wProcs.gl.BlendEquationSeparate
#define glBlendFuncSeparate gl3wProcs.gl.BlendFuncSeparate
#define glBufferData gl3wProcs.gl.BufferData
#define glClear gl3wProcs.gl.Clear
#define glClearColor gl3wProcs.gl.ClearColor
#define glCompileShader gl3wProcs.gl.CompileShader
#define glCreateProgram gl3wProcs.gl.CreateProgram
#define glCreateShader gl3wProcs.gl.CreateShader
#define glDeleteBuffers gl3wProcs.gl.DeleteBuffers
#define glDeleteProgram gl3wProcs.gl.DeleteProgram
#define glDeleteShader gl3wProcs.gl.DeleteShader
#define glDeleteTextures gl3wProcs.gl.DeleteTextures
#define glDeleteVertexArrays gl3wProcs.gl.DeleteVertexArrays
#define glDetachShader gl3wProcs.gl.DetachShader
#define glDisable gl3wProcs.gl.Disable
#define glDrawElements gl3wProcs.gl.DrawElements
#define glDrawElementsBaseVertex gl3wProcs.gl.DrawElementsBaseVertex
#define glEnable gl3wProcs.gl.Enable
#define glEnableVertexAttribArray gl3wProcs.gl.EnableVertexAttribArray
#define glGenBuffers gl3wProcs.gl.GenBuffers
#define glGenTextures gl3wProcs.gl.GenTextures
#define glGenVertexArrays gl3wProcs.gl.GenVertexArrays
#define glGetAttribLocation gl3wProcs.gl.GetAttribLocation
#define glGetIntegerv gl3wProcs.gl.GetIntegerv
#define glGetProgramInfoLog gl3wProcs.gl.GetProgramInfoLog
#define glGetProgramiv gl3wProcs.gl.GetProgramiv
#define glGetShaderInfoLog gl3wProcs.gl.GetShaderInfoLog
#define glGetShaderiv gl3wProcs.gl.GetShaderiv
#define glGetString gl3wProcs.gl.GetString
#define glGetStringi gl3wProcs.gl.GetStringi
#define glGetUniformLocation gl3wProcs.gl.GetUniformLocation
#define glIsEnabled gl3wProcs.gl.IsEnabled
#define glLinkProgram gl3wProcs.gl.LinkProgram
#define glPixelStorei gl3wProcs.gl.PixelStorei
#define glPolygonMode gl3wProcs.gl.PolygonMode
#define glReadPixels gl3wProcs.gl.ReadPixels
#define glScissor gl3wProcs.gl.Scissor
#define glShaderSource gl3wProcs.gl.ShaderSource
#define glTexImage2D gl3wProcs.gl.TexImage2D
#define glTexParameteri gl3wProcs.gl.TexParameteri
#define glUniform1i gl3wProcs.gl.Uniform1i
#define glUniformMatrix4fv gl3wProcs.gl.UniformMatrix4fv
#define glUseProgram gl3wProcs.gl.UseProgram
#define glVertexAttribPointer gl3wProcs.gl.VertexAttribPointer
#define glViewport gl3wProcs.gl.Viewport
#define glActiveTexture imgl3wProcs.gl.ActiveTexture
#define glAttachShader imgl3wProcs.gl.AttachShader
#define glBindBuffer imgl3wProcs.gl.BindBuffer
#define glBindSampler imgl3wProcs.gl.BindSampler
#define glBindTexture imgl3wProcs.gl.BindTexture
#define glBindVertexArray imgl3wProcs.gl.BindVertexArray
#define glBlendEquation imgl3wProcs.gl.BlendEquation
#define glBlendEquationSeparate imgl3wProcs.gl.BlendEquationSeparate
#define glBlendFuncSeparate imgl3wProcs.gl.BlendFuncSeparate
#define glBufferData imgl3wProcs.gl.BufferData
#define glBufferSubData imgl3wProcs.gl.BufferSubData
#define glClear imgl3wProcs.gl.Clear
#define glClearColor imgl3wProcs.gl.ClearColor
#define glCompileShader imgl3wProcs.gl.CompileShader
#define glCreateProgram imgl3wProcs.gl.CreateProgram
#define glCreateShader imgl3wProcs.gl.CreateShader
#define glDeleteBuffers imgl3wProcs.gl.DeleteBuffers
#define glDeleteProgram imgl3wProcs.gl.DeleteProgram
#define glDeleteShader imgl3wProcs.gl.DeleteShader
#define glDeleteTextures imgl3wProcs.gl.DeleteTextures
#define glDeleteVertexArrays imgl3wProcs.gl.DeleteVertexArrays
#define glDetachShader imgl3wProcs.gl.DetachShader
#define glDisable imgl3wProcs.gl.Disable
#define glDrawElements imgl3wProcs.gl.DrawElements
#define glDrawElementsBaseVertex imgl3wProcs.gl.DrawElementsBaseVertex
#define glEnable imgl3wProcs.gl.Enable
#define glEnableVertexAttribArray imgl3wProcs.gl.EnableVertexAttribArray
#define glGenBuffers imgl3wProcs.gl.GenBuffers
#define glGenTextures imgl3wProcs.gl.GenTextures
#define glGenVertexArrays imgl3wProcs.gl.GenVertexArrays
#define glGetAttribLocation imgl3wProcs.gl.GetAttribLocation
#define glGetIntegerv imgl3wProcs.gl.GetIntegerv
#define glGetProgramInfoLog imgl3wProcs.gl.GetProgramInfoLog
#define glGetProgramiv imgl3wProcs.gl.GetProgramiv
#define glGetShaderInfoLog imgl3wProcs.gl.GetShaderInfoLog
#define glGetShaderiv imgl3wProcs.gl.GetShaderiv
#define glGetString imgl3wProcs.gl.GetString
#define glGetStringi imgl3wProcs.gl.GetStringi
#define glGetUniformLocation imgl3wProcs.gl.GetUniformLocation
#define glIsEnabled imgl3wProcs.gl.IsEnabled
#define glLinkProgram imgl3wProcs.gl.LinkProgram
#define glPixelStorei imgl3wProcs.gl.PixelStorei
#define glPolygonMode imgl3wProcs.gl.PolygonMode
#define glReadPixels imgl3wProcs.gl.ReadPixels
#define glScissor imgl3wProcs.gl.Scissor
#define glShaderSource imgl3wProcs.gl.ShaderSource
#define glTexImage2D imgl3wProcs.gl.TexImage2D
#define glTexParameteri imgl3wProcs.gl.TexParameteri
#define glUniform1i imgl3wProcs.gl.Uniform1i
#define glUniformMatrix4fv imgl3wProcs.gl.UniformMatrix4fv
#define glUseProgram imgl3wProcs.gl.UseProgram
#define glVertexAttribPointer imgl3wProcs.gl.VertexAttribPointer
#define glViewport imgl3wProcs.gl.Viewport

#ifdef __cplusplus
}
Expand Down Expand Up @@ -671,6 +675,7 @@ static const char *proc_names[] = {
"glBlendEquationSeparate",
"glBlendFuncSeparate",
"glBufferData",
"glBufferSubData",
"glClear",
"glClearColor",
"glCompileShader",
Expand Down Expand Up @@ -715,13 +720,13 @@ static const char *proc_names[] = {
"glViewport",
};

GL3W_API union GL3WProcs gl3wProcs;
GL3W_API union GL3WProcs imgl3wProcs;

static void load_procs(GL3WGetProcAddressProc proc)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(proc_names); i++)
gl3wProcs.ptr[i] = proc(proc_names[i]);
imgl3wProcs.ptr[i] = proc(proc_names[i]);
}

#ifdef __cplusplus
Expand Down

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