[rlgl] Fix Not default Draw Mode breaking when changing texture

[maiconpintoabreu]

This PR is to fix the rlSetTexture as when you have different textures it will not override the mode that is default to GL_QUAD.
The fix is to check if the drawCounter has more then 1 and copy the previous mode to the new Draw.
No Need to change the order of rlSetTexture and rlBegin for it to work.

Removed vertexCount and textureId set from rlBegin as it is already set for every draw.

        RLGL.currentBatch->draws[RLGL.currentBatch->drawCounter - 1].vertexCount = 0;
        RLGL.currentBatch->draws[RLGL.currentBatch->drawCounter - 1].textureId = RLGL.State.defaultTextureId;

Initializer: https://github.com/maiconpintoabreu/raylib/blob/8d1add31d92da6f8704426f5bcb6c307e4e9cd85/src/rlgl.h#L2848
https://github.com/maiconpintoabreu/raylib/blob/8d1add31d92da6f8704426f5bcb6c307e4e9cd85/src/rlgl.h#L3124

Fix for the issue: #5142

RenderDoc Test:

BunnyMark:

Test Case

            DrawText("textured polygon", 20, 20, 20, DARKGRAY);

            DrawCircleV(ballPosition, (float)ballRadius, MAROON);
            
            for (int i = 0; i < 4100; i++) {
                DrawTexture(textureLogo, screenWidth/2 - texture.width/4, screenHeight/3 - texture.height/2, WHITE);
                
            }
            DrawTexture(textureLogo, screenWidth/2 - texture.width, screenHeight/3 - texture.height/2, WHITE);

            for (int i = 0; i < 800; i++) {
                DrawTexturePoly(texture, (Vector2){ GetScreenWidth()/2.0f, GetScreenHeight()/2.0f },
                                positions, texcoords, MAX_POINTS, WHITE);

                DrawTexturePoly(texture, (Vector2){ GetScreenWidth()/1.5f, GetScreenHeight()/2.0f },
                                positions, texcoords, MAX_POINTS, WHITE);
            }
            for (int i = 0; i < 5000; i++) {
                DrawTexture(textureLogo, screenWidth/2 - texture.width/4, screenHeight/2, WHITE);
            }

            for (int i = 0; i < bunniesCount; i++)
            {
                // NOTE: When internal batch buffer limit is reached (MAX_BATCH_ELEMENTS),
                // a draw call is launched and buffer starts being filled again;
                // before issuing a draw call, updated vertex data from internal CPU buffer is send to GPU...
                // Process of sending data is costly and it could happen that GPU data has not been completely
                // processed for drawing while new data is tried to be sent (updating current in-use buffers)
                // it could generates a stall and consequently a frame drop, limiting the number of drawn bunnies
                DrawTexture(texBunny, (int)bunnies[i].position.x, (int)bunnies[i].position.y, bunnies[i].color);
            }

            DrawLine(0,screenHeight/2,screenWidth,screenHeight/2, BLACK);
            
            DrawTexture(textureLogo, screenWidth/2 - texture.width, screenHeight/2, WHITE);

            DrawRectangle(0, 0, screenWidth, 40, BLACK);
            DrawText(TextFormat("bunnies: %i", bunniesCount), 120, 10, 20, GREEN);
            DrawText(TextFormat("batched draw calls: %i", 1 + bunniesCount/MAX_BATCH_ELEMENTS), 320, 10, 20, MAROON);

OpenGL Versions Test:
GRAPHICS_API_OPENGL_33 = Working
GRAPHICS_API_OPENGL_11 = Working
GRAPHICS_API_OPENGL_21 = Working
GRAPHICS_API_OPENGL_43 = Working
GRAPHICS_API_OPENGL_ES2 = Working

[maiconpintoabreu]

Shapes Colors Palette

Shapes Ring Drawing:

Shapes Lines Bezier:

Core 3d camera split

#5142 Code Sample

Jeff's Sample (2 squares and 2 triangles)

[maiconpintoabreu]

Did some cleaning on the commits and the extra draw was a commit pollution.

[raysan5]

@maiconpintoabreu Thank you very much again for reviewing this issue and all the time put into, also the wide testing for multiple examples and configurations.

Checking the code, it looks good to me and really elegant solution. Let me know if there is some more testing left before merging.

[maiconpintoabreu]

Thanks @raysan5, I am happy to help remove this limitation, about the tests, I think I did all the cases that I thought of.

[raysan5]

@maiconpintoabreu thanks for the improvement!