gles2: Major renderer optimization. Work in progress!

This moves all the rendering to a command list that is flushed to the GL as necessary, making most common activities upload a single vertex buffer per frame and dramatically reducing state changes. In pathological cases, like Emscripten running on iOS's Safari, performance can go from a dozen draw calls killing your performance to 1000 draw calls running smoothly. This is work in progress, and not ready to ship. Among other things, it has a hardcoded array that isn't checked for overflow. But the basic idea is sound!
libsdl-org · Sep 8, 2018 · 0d32752 · 0d32752
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diff --git a/src/render/opengles2/SDL_gles2funcs.h b/src/render/opengles2/SDL_gles2funcs.h
@@ -75,6 +75,7 @@ SDL_PROC(void, glDeleteFramebuffers, (GLsizei, const GLuint *))
 SDL_PROC(GLint, glGetAttribLocation, (GLuint, const GLchar *))
 SDL_PROC(void, glGetProgramInfoLog, (GLuint, GLsizei, GLsizei*, GLchar*))
 SDL_PROC(void, glGenBuffers, (GLsizei, GLuint *))
+SDL_PROC(void, glDeleteBuffers, (GLsizei, GLuint *))
 SDL_PROC(void, glBindBuffer, (GLenum, GLuint))
 SDL_PROC(void, glBufferData, (GLenum, GLsizeiptr, const GLvoid *, GLenum))
 SDL_PROC(void, glBufferSubData, (GLenum, GLintptr, GLsizeiptr, const GLvoid *))